Question 1

What is this vulnerability? (Essence + Consequences)

Accepted Answer

🚨 **Essence**: OAuth2 Proxy trusts the `X-Forwarded-Uri` header blindly.
💥 **Consequences**: Attackers bypass authentication entirely.
🔓 **Result**: Unauthorized access to protected routes.…

Question 2

Root Cause? (CWE/Flaw)

Accepted Answer

🛡️ **CWE-290**: Authentication Bypass by Spoofing.
🐛 **Flaw**: The proxy fails to validate the `X-Forwarded-Uri` header when skip-auth rules are active.…

Question 3

Who is affected? (Versions/Components)

Accepted Answer

📦 **Vendor**: oauth2-proxy.
📅 **Affected Versions**: **7.5.0** through **7.15.1**.
🔧 **Component**: OAuth2 Proxy (Reverse Proxy for Google/GitHub/OAuth).
✅ **Safe**: Versions < 7.5.0 or > 7.15.1.

Question 4

What can hackers do? (Privileges/Data)

Accepted Answer

🕵️ **Hackers Can**:
1. Bypass login screens.
2. Access sensitive internal APIs.
3. Read/Modify protected data.
📊 **Impact**: High Confidentiality & Integrity loss. No Auth Required!

Question 5

Is exploitation threshold high? (Auth/Config)

Accepted Answer

📉 **Threshold**: LOW.
🌐 **Network**: Remote (AV:N).
🧠 **Complexity**: Low (AC:L).
🔑 **Auth**: None required (PR:N).
👤 **User Interaction**: None (UI:N).
⚡ **Easy to exploit!**

Question 6

Is there a public Exp? (PoC/Wild Exploitation)

Accepted Answer

🚫 **Public Exploit**: No PoC provided in data.
📝 **Status**: Confirmed via GitHub Advisory (GHSA-7x63-xv5r-3p2x).
⚠️ **Risk**: Wild exploitation likely soon due to low barrier.

Question 7

How to self-check? (Features/Scanning)

Accepted Answer

🔍 **Self-Check**:
1. Check version: Is it 7.5.0 - 7.15.1?
2. Config: Do you use `skip-auth` rules?
3. Headers: Are you passing `X-Forwarded-Uri`?…

Question 8

Is it fixed officially? (Patch/Mitigation)

Accepted Answer

🛠️ **Fix**: Update to patched version (likely > 7.15.1).
📢 **Source**: Official GitHub Security Advisory.
✅ **Action**: Upgrade immediately if vulnerable.

Question 9

What if no patch? (Workaround)

Accepted Answer

🚧 **Workaround**:
1. **Disable** `skip-auth` rules if possible.
2. **Strip** `X-Forwarded-Uri` header at the edge (Load Balancer/NGINX).
3. **Validate** headers strictly before proxying.

Question 10

Is it urgent? (Priority Suggestion)

Accepted Answer

🔥 **Urgency**: CRITICAL.
📈 **Priority**: P1.
⏳ **Time**: Patch ASAP.
🎯 **Reason**: Remote, unauthenticated, high impact. Zero-day risk!

Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-40575 — AI Deep Analysis Summary

Q1What is this vulnerability? (Essence + Consequences)

Q2Root Cause? (CWE/Flaw)

Q3Who is affected? (Versions/Components)

Q4What can hackers do? (Privileges/Data)

Q5Is exploitation threshold high? (Auth/Config)

Q6Is there a public Exp? (PoC/Wild Exploitation)

Q7How to self-check? (Features/Scanning)

Q8Is it fixed officially? (Patch/Mitigation)

Q9What if no patch? (Workaround)

Q10Is it urgent? (Priority Suggestion)

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